Think about the actual environment the magic blades are going to be working in. Your arrow may accelerate quickly in an archery frame of reference, but it starts out a zero and is pretty slow while the magic is supposed to be keeping those blades from planing. How long does it take for the fletching to stabilize the shaft, and how much does the shaft flex. The magnitude of the flex is going to be displacing the blades. In fact, they're going to be yawing probably faster than they'll be going in the first feet.

Has anyone made blades that "screw around" the point to match the "screwing around" of the fletching? That might be worth an experiment.

The blades actually resist the rotation caused by the fletching. They're going to do it more the faster the rotation. So there should be an enhancement downrange no matter what happens immediately at release. What might be beneficial at release would be the new shape of those helical blades offering less resistance to being driven side against the air. They will now offer a curved side instead of a flat one.

But just brainstorming.......... and trying to cause some thought a bit off the usual path.............

BTW, there might also be an enhanced penetration from them as well. Since lots of hits are through-and-through, the real benefit if there is easier penetration would be from a reduction of blade area.

good luck with your quest..........